'Error: Unable to 'pub upgrade' flutter tool. Retrying in five seconds

Log:

E:\Flutter>flutter doctor Checking Dart SDK version... Downloading Dart SDK from Flutter engine ead227f a... Unzipping Dart SDK... Updating flutter tool... Error: Unable to 'pub upgrade' flutter tool. Retrying in five seconds...

Waiting for 0 seconds, press CTRL+C to quit ... Error: Unable to 'pub upgrade' flutter tool. Retrying in five seconds...

Waiting for 0 seconds, press CTRL+C to quit ... Error: Unable to 'pub upgrade' flutter tool. Retrying in five seconds...

Waiting for 0 seconds, press CTRL+C to quit ... Error: Unable to 'pub upgrade' flutter tool. Retrying in five seconds...

Waiting for 0 seconds, press CTRL+C to quit ... Error: Unable to 'pub upgrade' flutter tool. Retrying in five seconds...

Waiting for 0 seconds, press CTRL+C to quit ... Error: Unable to 'pub upgrade' flutter tool. Retrying in five seconds...

Android studio log

flutter dart

Solution 1:^[1]

First Make sure you have a working internet connection and if this issue still exists then, this error may be because the dart sdk may have not been properly downloaded. The simplest solution is to delete the cache folder located in flutter/bin(location where flutter is installed) and then Run flutter doctor

Solution 2:^[2]

I found my antivirus blocks pub upgrade,I had same issue while hitting flutter doctor, I turned off my antivirus and tried to run "flutter doctor" again, and worked well!

Solution 3:^[3]

I fix that by:

Ctrl+C to stop infinite error loop.
Kill the Dart process in Windows Task Manager.
Delete the cache folder located in flutter/bin directory.
Run in command line flutter pub cache repair.

After that I run flutter doctor and get predictable results:

e:\tools>flutter doctor
Doctor summary (to see all details, run flutter doctor -v):
[?] Flutter (Channel stable, v1.12.13+hotfix.9, on Microsoft Windows [Version
    6.1.7601], locale ru-RU)
[?] Android toolchain - develop for Android devices (Android SDK version 28.0.3)

[?] Android Studio (version 3.6)
[!] IntelliJ IDEA Community Edition (version 2019.2)
    X Flutter plugin not installed; this adds Flutter specific functionality.
    X Dart plugin not installed; this adds Dart specific functionality.
[!] IntelliJ IDEA Ultimate Edition (version 2019.2)
    X Flutter plugin not installed; this adds Flutter specific functionality.
    X Dart plugin not installed; this adds Dart specific functionality.
[?] VS Code (version 1.44.2)
[?] Connected device (1 available)

! Doctor found issues in 2 categories.

Solution 4:^[4]

windows: simplest and easiest way is download the latest version flutter sdk. replace manually current folder by pasting downloaded flutter folder instead of the current folder in c drive. always choose replace and paste.

after finishing that check with flutter doctor. my issue solved

Solution 5:^[5]

Solved this issue when Run the CMD as administrative.

Solution 6:^[6]

This issue will come in protected network as well as due to anti-virus. Even I was facing the same. I downloaded latest stable version manually from the following link, which doesn't required any update process and it works for now..

Download Link For Flutter in Zip format

Solution 7:^[7]

I updated the flutter SDK via git pull, then the flutter doctor command works.

Solution 8:^[8]

Just delete the cache folder in flutter/bin and run flutter doctor again!!

Solution 9:^[9]

Just Deactivate your antivirus and run it again. It would work fine. I had the same issue before.

Solution 10:^[10]

I deactivated my antivirus for some time and executed flutter doctor command once again in cmd and got fruitful results after hours of patience. One more thing to note, you should ensure that path of dart-sdk folder should be added to the path in user variables.

Solution 11:^[11]

It seems it is not being able to "unzip" the downloaded Dart file because it misses 7-zip uncompressor. I installed it and it worked! It will deal with .7z files. I hope it works for other people too!!

Solution 12:^[12]

I had the same problem and it was solved.

Steps:

Download Dart and Filters SDK then Decompress these files and move them to this directory.

C: \ Define the variables in path:

Solution 13:^[13]

Delete cache directory in flutter/bin
Then run flutter doctor

Solution 14:^[14]

Make sure you downloaded the windows powershell i use windows 8 it wasn't installed by default , when i downloaded it it worked for me.

Solution 15:^[15]

Check your flutter bin path in environment variable(User Variables). If not go to Under User variables check if there is an entry called Path:in that add this flutter/bin path.

Solution 16:^[16]

Strangly when I kill the dart process in Windows Task Manager it is working. But sometimes even when dart process is running update working.

Solution 17:^[17]

I had to turn off the Android Emulator. It was running for me...

Solution 18:^[18]

I got the same error and was not able to get rid of it. So I deleted the flutter and instead of cloning it I downloaded the zip from the flutter website and extracted it. Now it works just fine.

Solution 19:^[19]

Manually downloading the SDK from flutter website fixed the issue.

Still dont know why this problem occured tho.

Solution 20:^[20]

If you are using Avast (or possibly some other anti virus too) on Mac and have recently updated the OS to Big Sur then follow the below steps to fix this issue

Open Avast and in the Web Shield area disable the "Scan secure connection".
Run flutter config --no-analytics and then run pub upgrade.

This should probably fix the issue.

You can also refer to below threads in Github for more details about the cause

https://github.com/flutter/flutter/issues/40515

https://github.com/flutter/flutter/issues/68999

Solution 21:^[21]

In my case, the error resolve after adding below folder into exclude option in anti virus

Flutter SDK location D:\Android\flutter_windows\flutter\*.

Flutter Local Pub folder C:\Users\hitesh\AppData\Local\Pub

Solution 22:^[22]

You get the error -- "Pub failed to delete entry because it was in use by another process. This may be caused by a virus scanner or having a file in the directory open in another application. Error (1): Unable to 'pub upgrade' flutter tool. Retrying in five seconds... (1 tries left)" even if you are in one of the flutter directories from Windows explorer. Close the window and try running Flutter doctor. This will resolve.

Solution 23:^[23]

If anyone faces this problem on macOS with AdGuard installed. Try this:

Go AdGuard Preferences -> Network -> Automatically filter applications -> Select Mode... and change mode to Automatic Proxy.

Solution 24:^[24]

Pub failed to delete entry because it was in use by another process. This may be caused by a virus scanner or having a file in the directory open in another application. Error (1): Unable to 'pub upgrade' flutter tool. Retrying in five seconds... (9 tries left)

Solution 25:^[25]

Tried switch to Dev channel and got stuck with "Unable to pub upgrade". Did everything and nothing worked.

This is what I did:

Renamed the Flutter SDK folder
Download the latest Flutter SDK
Extract to the same location of previous renamed SDK
Flutter channel Dev
Flutter upgrade

And everything back to normal.

Solution 26:^[26]

Source of Problem

It might be possible that you don't have enough free disk space. That's what caused my problems to begin with.

Solution

In my case,

First I had to clean up space to remove any unused files.
Then I had to overwrite the flutter SDK folder due to corruption. The SDK can be found here.

Solution 27:^[27]

I had the same issue with my MacBook M1. I tried deleting and running flutter pub cache repair But It didn't work for me.

Then I ran the command softwareupdate --install-rosetta and accepted the software licences & agreement (After installing XCode). Now the command flutter works fine. :)

Solution 28:^[28]

Tried all of the above without success. The search order in the PATH system variable turned out to be the problem:

it was:

    G:\My Drive\Compilers\flutter\bin;
    G:\My Drive\Compilers\flutter\bin\flutter;
    G:\My Drive\Compilers\flutter\bin\flutter.bat;
    G:\My Drive\Compilers\flutter\bin\dart.exe;
    G:\My Drive\Compilers\flutter\bin\dart;
    G:\My Drive\Compilers\flutter\bin\dart.bat;

changed it to:

    G:\My Drive\Compilers\flutter\bin\flutter
    G:\My Drive\Compilers\flutter\bin\flutter.bat
    G:\My Drive\Compilers\flutter\bin\dart
    G:\My Drive\Compilers\flutter\bin\dart.bat

that fixed it

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution	Source
Solution 1
Solution 2	TuGordoBello
Solution 3	Mahesh Jamdade
Solution 4	Leo Johny Thayyil
Solution 5	Ronnie Tws
Solution 6	RajeshVijayakumar
Solution 7	iamwent
Solution 8	Rishi Chhabra
Solution 9	Ebrand Managers
Solution 10	Jeff
Solution 11	Márcio Ramos
Solution 12
Solution 13	Vasanth Korada
Solution 14	robert maurice
Solution 15	user12775640
Solution 16	Blasanka
Solution 17	giorgio79
Solution 18	Vijay Patil
Solution 19	heimzza
Solution 20
Solution 21	TuGordoBello
Solution 22	Jayashree Prasad
Solution 23	ANDYNVT
Solution 24	darshan Savaj
Solution 25	Andre.L
Solution 26	Ayush Mandowara
Solution 27	Chanaka Niroshan
Solution 28	Martyn Wright

'Error: Unable to 'pub upgrade' flutter tool. Retrying in five seconds

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